Ratchet-wheel for clocks.



N0. 767,861. PATENTED AUG. 9, 1904. T. B. STEPHENSON, JR. RATGHET WHEELFOR CLOCKS.

APPLICATION FILED MAR. 24, 1904. N0 MODEL.

M272 55555 f/7V5/7ZZ7F @gjggf g ia/g d h UNITED STATES Patented August9, 190' PATENT OEEIcE.

THOMAS B. STEPHENSON, JR, OF BRISTOL, CONNECTICUT, ASSIGNOR TO SESSIONSCLOCK COMPANY, OF FORESTVILLE, CONNECTICUT, A COR- PORATION.

RATCHET-WHEEL FOR CLOCKS.

SPECIFICATION forming part of Letters Patent No. 767,361, dated August9, 1904.

Application filed March 24, 1904.

To all whom, it may concern.-

Be it known that I, THOMAS B. STEPHENSON, Jr., residing at Bristol, inthe county of Hartford and State of Connecticut. have invented new anduseful Improvements in Ratchet- VVheels for Clocks, of which thefollowing is a specification.

My invention relates to improvements in ratchet-Wheels for clocks; andthe objects of my improvement are economy in construction and efliciencyin use.

In the accompanying drawings, Figure l is a side elevation of myratchet-wheel, together with its hub and shaft and the main wheel of aclock. Fig. 2 is a sectional elevation of the same on the line a m ofFig. 1. Fig. 3 is a detached side elevation of the rim of theratchetwheel. Fig. 4 is a like view of the hub of the ratchet-wheel.

The shaft 5 is or may be of any ordinary construction. Instead ofmounting a ratchet- Wheel directly on this shaft I form a ratchetwheelhub of a special construction and mount the said hub on the said shaft 5and then mount a separately-formed ratchet-wheel rim 6 0n the said hubwith the main wheel 7, which is also mounted thereon.

The hub A is provided with a central bore or hole 8, Fig. 4, to'receivethe mainshaft 5 and is or may be secured on the said shaft in anyordinary manner. It is provided at one end or side with the ordinaryround tenon 9 to receive the main Wheel 7, at its middle portion with asecond tenon 10 of a little larger diameter to receive the ratchet-wheelrim 6, and at the end or side opposite the tenon 9 with a flange 11. ofa larger diameter than the second tenon 10. This second tenon 10 is atfirst formed of a round or cylindrical form and is afterward changedinto a non-cylindrical form to convert it into a driver-tl1at is to say,a form that will necessitate the rotation therewith of a part mountedthereon and fitted thereto. In the present example and as preferred thisdriving form is given to the said second tenon 10 by means of one ormore driving portions in the form of recesses 12, which are made as deepas they can be and not cut into the tenon 9, although the depth is notSerial No! 199,769. (No model.)

material. As shown, the recesses 12 extend continuously through thesecond tenon 10 and adjacent flange 11; but this is only for convenienceof construction, the portion of the said recesses that are within thesaid flange having no function.

The inner edge of the ratchet-wheel rim 6 is mainly circular and of adiameter to fit the cylindrical portion of the second tenon 10 and inaddition to this circular form is provided with as many inwardprojections or driving portions 13 as there are recesses 12 in the tenon10, the said projecting portions being located and shaped to fit thesaid recesses 12 of the tenon 10 when the said ratchet-wheel rim ismounted thereon.

After the ratchet-wheel hub A is mounted on or secured to the shaft 5the ratchet-wheel rim 6 is placed on the second tenon 10, with itsinwardly-projecting portions resting within the driving-recesses 12. Themain wheel 7 is then placed on the tenon 9, together with the ordinaryspring-Washer 1A, and secured thereon in any ordinary n1anneras, forexample, by staking or' upsetting the outer portion of the said tenon.The ratchet-wheel rim is then securelyheld in place on the hub A, so asto move therewith substantially as if formed in one and the same piece.

By my improvement the complete ratchet- Wheel is cheaply produced, andby making the ratchet-wheel rim separately from its hub the said rim mayreadily be formed by a die and punch and, if desired, of a diiferent orharder material from that employed for the ratchethuh.

I claim as my invention 1. The herein-described ratchet-wheel for clocksconsisting of the ratchet-wheel hub having a tenon for the main wheel, asecond tenon for the ratchet-wheel rim and a flange larger than the saidsecond tenon, the said second tenon havinga driving portion, and theseparately-formed ratchetwheel rim having a driving portion, and mountedon the said second tenon of the said ratchet-Wheel hub with the drivingportions of the said hub and rim in engagement with each other.

2'. The combination of the ratchet-wheel hub shaft and having a tenonfor the main Wheel, a second tenon for the ratchet-Wheel rim and aflange of a larger diameter than the said second tenon, and theseparately-formed ratchet- Wheel rim, the said second tenon and the holein the separately-formed ratchet-Wheel rim being of a non-cylindricalform fitted to each other to necessitate their simultaneous rotationsubstantially as described.

THOMAS B. STEPHENSON, JR.

Witnesses:

E. A. FREEMAN, CHAS. F. SMITH.

